This version of the software is the long established VB6/MS Access version. It is aimed at the 1 to 10 user marketplace but not limited by number of users.
This version of the software is the newly released C# .NET/MS SQL Server version. It is a modern web services solution, architectured using the latest Microsoft technologies for building secure, reliable web applications. It is aimed at the 5+ user marketplace, a solution which can also be used on a single user standalone basis.